- Boilers
- Gas boiler
105
Chaffoteaux 105 on a gas boiler: insufficient water circulation
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
Chaffoteaux 105 means the water is not circulating enough through the heating circuit. Read the pressure gauge, top up with the filling procedure if the pressure is low and, if it repeats, call a technician.
Safety first
Stop and check this first
- If you smell gas: Chaffoteaux says to close the main gas tap, open the windows and call the technician. Do not touch switches, plugs or anything that sparks, leave the home and call your gas distributor's emergency number from the street.
- Do not make topping up a routine: if the pressure drops often, Chaffoteaux asks you to switch the boiler off, set the external switch to OFF, close the gas tap and call a technician to look for leaks.
Safe checks you can perform
- Pressure gauge reading
- Top up with the filling procedure
- One RESET and how often you top up
- Pump, bleeding and leaks by the technician
Leave these tasks to a qualified professional
- Do not attempt this professional task: Pump check
- Do not attempt this professional task: Circuit bleeding
- Do not attempt this professional task: Tightness check of water parts
What a technician must be able to justify
Technician visit
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Pump check
What they doThe technician checks the pump LED and the flow switch state in the boiler menu, and confirms the pump turns and is powered.
They must show youthe LED and flow switch state.
In writingwhether the pump was freed or replaced, with the part reference and why.
Circuit bleeding
What they doThe technician runs the de-aeration cycle of about 7 minutes, opens the manual bleed valve on the heat exchanger until water comes out without air and bleeds the radiators.
They must show youthe final pressure after bleeding.
In writingwhat was bled and the pressure the system is left at.
Tightness check of water parts
What they doThe technician checks the tightness of the water parts and the system, as Chaffoteaux asks in the annual maintenance.
They must show youwhere the leak is, if there is one.
In writingthe seal or part replaced and why.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Follow these steps
Note: Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
Pressure gauge reading
- Who:
- you.
- How:
- with the system cold, read the pressure on the boiler gauge. Chaffoteaux says it should be between 0.6 and 1.5 bar.
- Result that matters:
- whether the pressure is below 0.6 bar.
- If it is low:
- top up with the filling procedure (next check).
- If it is in range:
- lack of water does not explain 105; it points to air or the pump.
- Evidence to keep:
- a dated photo of the gauge.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Top up with the filling procedure
- Who:
- you.
- How:
- open the filling valve at the bottom of the boiler and hold for 5 seconds the button given in the filling procedure until PURGE appears (the user manual names it both ESC and MODE). When the gauge reads between 0.6 and 1.5 bar, close the tap and press the button again.
- Result that matters:
- whether the pressure holds and 105 clears.
- If it clears:
- note the date; watch the pressure over the next days.
- If it stays with correct pressure:
- go to the next check.
- Evidence to keep:
- photos of the gauge before and after.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
One RESET and how often you top up
- Who:
- you.
- How:
- if 105 is still shown, press RESET once; Chaffoteaux lists it in the lockout table, which is cleared with that button. Note every time you top up.
- Result that matters:
- whether the code returns and how often the pressure drops.
- If it returns or you top up often:
- switch off, external switch to OFF, close the gas tap and call a technician, as Chaffoteaux asks.
- If it does not return:
- an isolated episode; keep your notes.
- Evidence to keep:
- a list of top-up dates and when the code appeared.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Pump, bleeding and leaks by the technician
- Who:
- qualified technician.
- How:
- checks the pump LED, bleeds the circuit with the de-aeration cycle and looks for water leaks.
- Result that matters:
- whether water is missing, there is air or the pump is blocked.
- If the pump LED is red:
- pump blocked or no water.
- If there are leaks:
- they are repaired before refilling.
- Evidence to keep:
- a job sheet with the LED state, what was bled and what was repaired.
Chaffoteaux reserves repairs for specialised technicians. Opening the casing, the pump and the heat exchanger bleed valve are not user work.
Evidence: Chaffoteaux Pigma Advance 25, 30 y 35, instrucciones de instalación y de utilización
Still not solved
If the error persists, stop here. See what the technician must do and show you.
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Boilers
- Brand
- Chaffoteaux
- Product type
- Gas boiler
Known code variants
- 1 05
- Chaffoteaux 1 05
- Error 105 Chaffoteaux
- Pigma 105
- Pigma Advance 105
What it means
In the Pigma Advance table, 105 is listed as insufficient circulation, in the main circuit group alongside 103 to 107. If the heating water does not circulate enough, the boiler stops for safety; Chaffoteaux says to restore it by topping up and, if topping up is needed often, to look for leaks. On the pump, a red LED means the pump is blocked or there is no water. 105 does not separate low water, air in the circuit or a blocked pump.
Warnings and stop conditions
- Criticaleditorial warning
If you smell gas: Chaffoteaux says to close the main gas tap, open the windows and call the technician. Do not touch switches, plugs or anything that sparks, leave the home and call your gas distributor's emergency number from the street.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
- Highsource verified
Do not make topping up a routine: if the pressure drops often, Chaffoteaux asks you to switch the boiler off, set the external switch to OFF, close the gas tap and call a technician to look for leaks.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Symptoms and causes
Probable causes · in order
- Not enough water in the circuitCommon
Fits if the gauge reads below 0.6 bar with the system cold. Chaffoteaux says to restore operation by topping up.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
- Air in the circuitPossible
Fits after filling, draining or bleeding radiators. Chaffoteaux provides a de-aeration cycle of about 7 minutes and radiator bleeding at commissioning.
Evidence: Chaffoteaux Pigma Advance 25, 30 y 35, instrucciones de instalación y de utilización
- Blocked pumpPossible
Fits if the pressure is correct and the code returns. A red LED on the pump means the pump is blocked or there is no water; the technician checks it.
Evidence: Chaffoteaux Pigma Advance 25, 30 y 35, instrucciones de instalación y de utilización
- Water leak in the systemPossible
Fits if you have to top up often. Chaffoteaux says a very frequent pressure drop points to a water leak in the system.
Evidence: Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario · Chaffoteaux Pigma Advance 25, 30 y 35, instrucciones de instalación y de utilización
Virtual technician
Does 105 still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
Chaffoteaux Pigma Advance y Pigma Ultra, manual de usuario
Chaffoteaux · 2018 · manual
- 2
Chaffoteaux Pigma Advance 25, 30 y 35, instrucciones de instalación y de utilización
Chaffoteaux · 2019 · manual
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